leaf

A leaf is an organ of a vascular plant and is the principal lateral appendage of the stem. The leaves and stem together form the shoot. Leaves are collectively referred to as foliage, as in "autumn foliage". Although leaves can be seen in many different shapes, sizes and textures, typically a leaf is a thin, dorsiventrally flattened organ, borne above ground and specialized for photosynthesis. In most leaves, the primary photosynthetic tissue, the palisade mesophyll, is located on the upper side of the blade or lamina of the leaf but in some species, including the mature foliage of Eucalyptus, palisade mesophyll is present on both sides and the leaves are said to be isobilateral. Most leaves have distinctive upper surface (adaxial) and lower surface (abaxial) that differ in colour, hairiness, the number of stomata (pores that intake and output gases), epicuticular wax amount and structure and other features. Broad, flat leaves with complex venation are known as megaphylls and the species that bear them, the majority, as broad-leaved or megaphyllous plants. In others, such as the clubmosses, with different evolutionary origins, the leaves are simple, with only a single vein and are known as microphylls. Some leaves, such as bulb scales are not above ground, and in many aquatic species the leaves are submerged in water. Succulent plants often have thick juicy leaves, but some leaves are without major photosynthetic function and may be dead at maturity, as in some cataphylls and spines.
Deer. - A herd of deer on a rut.
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Deer.

Added yesterday by Grażyna

12

mountain landscape - mountains, autumn trees
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mountain landscape

Added 2 days ago by sandra

87

Red leaves over water. - Red leaves over water.
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Red leaves over water.

Added 2 days ago by Zeta

130

Yellow marigolds. - Yellow marigolds on the pond.
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Yellow marigolds.

Added 2 days ago by Zeta

130 1

Japanese garden. - Japanese-style garden.
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Japanese garden.

Added 3 days ago by Grażyna

173

Greek tomatoes. - Various tomatoes !!
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Greek tomatoes.

Added 4 days ago by Grażyna

52

Alley in the park. - A beautiful alley in the park !!!
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Alley in the park.

Added 5 days ago by Grażyna

133

The source of Mary - An object in the Stołowe Mountains
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The source of Mary

Added 6 days ago by Elddrz

213

Panorama - Panorama with Errant Rocks
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Panorama

Added 6 days ago by Elddrz

64

Birches at the road. - Birches at the road. Autumn.
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Birches at the road.

Added 6 days ago by Zeta

121

Lake in Slovenia. - Lake in Slovenia.
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Lake in Slovenia.

Added 6 days ago by Zeta

49

autumn landscape - autumn, colorful leaves, forest stream
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autumn landscape

Added week ago by sandra

127

Alley in the park. - Szpaler trees in the park.
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Alley in the park.

Added week ago by Zeta

55

Lone Tree. - A lonely tree among fields.
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Lone Tree.

Added 8 days ago by Zeta

44

autumn landscape - autumn, forest, road, leaves
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autumn landscape

Added 10 days ago by sandra

71

by the lake - lake, fog, trees, reflection
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by the lake

Added 10 days ago by sandra

102

birch forest - forest, trees, first snow
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birch forest

Added 11 days ago by sandra

161

BAJKOWY VIEW - Leave, rest, relax
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BAJKOWY VIEW

Added 12 days ago by ada

66

Majorca. Landscape. - Majorca. Sea landscape.
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Majorca. Landscape.

Added 2 weeks ago by Zeta

63

Avenue of old trees. - Avenue of old trees.
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Avenue of old trees.

Added 2 weeks ago by Zeta

28

Frog next to a lily. - Frog on the pond by the lily.
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Frog next to a lily.

Added 2 weeks ago by Zeta

44

Lane in the spring park. - Lane in the spring park.
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Lane in the spring park.

Added 2 weeks ago by Zeta

32

mountain landscape - mountain landscape, autumn tree
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mountain landscape

Added 3 weeks ago by sandra

176

Sunset. - Sunset in the countryside.
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Sunset.

Added 3 weeks ago by Zeta

96

above the river - path on the river, trees, rays of the sun
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above the river

Added 3 weeks ago by sandra

104

Landscape - colorful puzzle-puzzle
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Landscape

Added 4 weeks ago by andi

153